23311331231220 has 72 divisors (see below), whose sum is σ = 72435697556040. Its totient is φ = 6064736578560.

The previous prime is 23311331231173. The next prime is 23311331231233. The reversal of 23311331231220 is 2213213311332.

23311331231220 is a `hidden beast` number, since 2 + 3 + 3 + 1 + 13 + 312 + 312 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3699152129124 + 19612179102096 = 1923318^2 + 4428564^2 .

It is a super-2 number, since 2×23311331231220² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1579351105 + ... + 1579365864.

It is an arithmetic number, because the mean of its divisors is an integer number (1006051354945).

Almost surely, 2^{23311331231220} is an apocalyptic number.

23311331231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23311331231220 is an abundant number, since it is smaller than the sum of its proper divisors (49124366324820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23311331231220 is a wasteful number, since it uses less digits than its factorization.

23311331231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3158717025 (or 3158717020 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 23311331231220 its reverse (2213213311332), we get a palindrome (25524544542552).

The spelling of 23311331231220 in words is "twenty-three trillion, three hundred eleven billion, three hundred thirty-one million, two hundred thirty-one thousand, two hundred twenty".